On Thu, 29 Sep 2022 02:52:06 +0000 xu.xin.sc@xxxxxxxxx wrote: > From: xu xin <xu.xin16@xxxxxxxxxx> > > Before enabling use_zero_pages by setting /sys/kernel/mm/ksm/ > use_zero_pages to 1, pages_sharing of KSM is basically accurate. But > after enabling use_zero_pages, all empty pages that are merged with > kernel zero page are not counted in pages_sharing or pages_shared. that's because those pages are not shared between different processes. > That is because the rmap_items of these ksm zero pages are not > appended to The Stable Tree of KSM. > > We need to add the count of empty pages to let users know how many empty > pages are merged with kernel zero page(s). why? do you need to know how many untouched zero pages a process has? does it make a difference if the zero page is really untouched or if it was touched in the past but it is now zero? > > Please see the subsequent patches for details. > > > > > *** BLURB HERE *** > > xu xin (3): > ksm: abstract the function try_to_get_old_rmap_item > ksm: add the accounting of zero pages merged by use_zero_pages > ksm: add zero_pages_merged in Documentation > > Documentation/admin-guide/mm/ksm.rst | 10 ++- > mm/ksm.c | 122 +++++++++++++++++++++------ > 2 files changed, 106 insertions(+), 26 deletions(-) >
